Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 807
The gates F are made of white-oak timber, one foot thick, laid one above the other, and connectedtogether with four bolts, two inches in diameter, passing through the feet of the castings H, to wliichthe screws I are attached, and passing down through the middle of the gate to a cast-iron plate…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.